#include <stdio.h>

int main()
{
    int a,b,c,temp1,temp2,temp3;
    scanf("%d %d %d",&a,&b,&c);

    if(a>b)
        {
            temp1=a;
            a=b;
            b=temp1;
        }
    if(a>c)
        {
            temp2=c;
            c=a;
            a=temp2;
        }
    if(b>c)
        {
            temp3=b;
            b=c;
            c=temp3;
        }
    
    if(a+b<=c)
        {
            printf("Not triangle\n");
            return 0;
        }
    if(a*a+b*b==c*c)
        printf("Right triangle\n");
    if(a*a+b*b>c*c)
        printf("Acute triangle\n");    
    if(a*a+b*b<c*c)
        printf("Obtuse triangle\n");
    if(a==b || a==c || b==c)
        printf("Isosceles triangle\n");
    if(a==b && b==c)
        printf("Equilateral triangle\n");
        
    return 0;
}